Hey all. I've been playing around with the tubes in my AC15c1. Right now i've got new tungsol 12ax7 in v1 a jj in v2 and an eh 12at7 in the PI. (haven't gotten around to buying any EL84's, this my first el84 amp). I like the normal channel with the TS but I've been thinking about buying a 5751 for V2 to bring down the gain and smooth out the output of the topboost channel for better blending. My question: Is it a problem to have a 12ax7 before a 5751 in a circuit? Does the higher gain factor of the ax7 damage/overwork the 5751? Anyone done this? what were the results? Cheers!